mountd.c revision 159017
1/* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Herb Hasler and Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#ifndef lint 34static const char copyright[] = 35"@(#) Copyright (c) 1989, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37#endif /*not lint*/ 38 39#if 0 40#ifndef lint 41static char sccsid[] = "@(#)mountd.c 8.15 (Berkeley) 5/1/95"; 42#endif /*not lint*/ 43#endif 44 45#include <sys/cdefs.h> 46__FBSDID("$FreeBSD: head/usr.sbin/mountd/mountd.c 159017 2006-05-28 18:59:28Z rodrigc $"); 47 48#include <sys/param.h> 49#include <sys/mount.h> 50#include <sys/fcntl.h> 51#include <sys/stat.h> 52#include <sys/syslog.h> 53#include <sys/sysctl.h> 54#include <sys/linker.h> 55#include <sys/module.h> 56 57#include <rpc/rpc.h> 58#include <rpc/rpc_com.h> 59#include <rpc/pmap_clnt.h> 60#include <rpc/pmap_prot.h> 61#include <rpcsvc/mount.h> 62#include <nfs/rpcv2.h> 63#include <nfs/nfsproto.h> 64#include <nfsserver/nfs.h> 65 66#include <arpa/inet.h> 67 68#include <ctype.h> 69#include <err.h> 70#include <errno.h> 71#include <grp.h> 72#include <libutil.h> 73#include <limits.h> 74#include <netdb.h> 75#include <pwd.h> 76#include <signal.h> 77#include <stdio.h> 78#include <stdlib.h> 79#include <string.h> 80#include <unistd.h> 81#include "pathnames.h" 82#include "mntopts.h" 83 84#ifdef DEBUG 85#include <stdarg.h> 86#endif 87 88/* 89 * Structures for keeping the mount list and export list 90 */ 91struct mountlist { 92 struct mountlist *ml_next; 93 char ml_host[RPCMNT_NAMELEN+1]; 94 char ml_dirp[RPCMNT_PATHLEN+1]; 95}; 96 97struct dirlist { 98 struct dirlist *dp_left; 99 struct dirlist *dp_right; 100 int dp_flag; 101 struct hostlist *dp_hosts; /* List of hosts this dir exported to */ 102 char dp_dirp[1]; /* Actually malloc'd to size of dir */ 103}; 104/* dp_flag bits */ 105#define DP_DEFSET 0x1 106#define DP_HOSTSET 0x2 107 108struct exportlist { 109 struct exportlist *ex_next; 110 struct dirlist *ex_dirl; 111 struct dirlist *ex_defdir; 112 int ex_flag; 113 fsid_t ex_fs; 114 char *ex_fsdir; 115 char *ex_indexfile; 116}; 117/* ex_flag bits */ 118#define EX_LINKED 0x1 119 120struct netmsk { 121 struct sockaddr_storage nt_net; 122 struct sockaddr_storage nt_mask; 123 char *nt_name; 124}; 125 126union grouptypes { 127 struct addrinfo *gt_addrinfo; 128 struct netmsk gt_net; 129}; 130 131struct grouplist { 132 int gr_type; 133 union grouptypes gr_ptr; 134 struct grouplist *gr_next; 135}; 136/* Group types */ 137#define GT_NULL 0x0 138#define GT_HOST 0x1 139#define GT_NET 0x2 140#define GT_DEFAULT 0x3 141#define GT_IGNORE 0x5 142 143struct hostlist { 144 int ht_flag; /* Uses DP_xx bits */ 145 struct grouplist *ht_grp; 146 struct hostlist *ht_next; 147}; 148 149struct fhreturn { 150 int fhr_flag; 151 int fhr_vers; 152 nfsfh_t fhr_fh; 153}; 154 155/* Global defs */ 156char *add_expdir(struct dirlist **, char *, int); 157void add_dlist(struct dirlist **, struct dirlist *, 158 struct grouplist *, int); 159void add_mlist(char *, char *); 160int check_dirpath(char *); 161int check_options(struct dirlist *); 162int checkmask(struct sockaddr *sa); 163int chk_host(struct dirlist *, struct sockaddr *, int *, int *); 164void del_mlist(char *hostp, char *dirp); 165struct dirlist *dirp_search(struct dirlist *, char *); 166int do_mount(struct exportlist *, struct grouplist *, int, 167 struct xucred *, char *, int, struct statfs *); 168int do_opt(char **, char **, struct exportlist *, struct grouplist *, 169 int *, int *, struct xucred *); 170struct exportlist *ex_search(fsid_t *); 171struct exportlist *get_exp(void); 172void free_dir(struct dirlist *); 173void free_exp(struct exportlist *); 174void free_grp(struct grouplist *); 175void free_host(struct hostlist *); 176void get_exportlist(void); 177int get_host(char *, struct grouplist *, struct grouplist *); 178struct hostlist *get_ht(void); 179int get_line(void); 180void get_mountlist(void); 181int get_net(char *, struct netmsk *, int); 182void getexp_err(struct exportlist *, struct grouplist *); 183struct grouplist *get_grp(void); 184void hang_dirp(struct dirlist *, struct grouplist *, 185 struct exportlist *, int); 186void huphandler(int sig); 187int makemask(struct sockaddr_storage *ssp, int bitlen); 188void mntsrv(struct svc_req *, SVCXPRT *); 189void nextfield(char **, char **); 190void out_of_mem(void); 191void parsecred(char *, struct xucred *); 192int put_exlist(struct dirlist *, XDR *, struct dirlist *, int *, int); 193void *sa_rawaddr(struct sockaddr *sa, int *nbytes); 194int sacmp(struct sockaddr *sa1, struct sockaddr *sa2, 195 struct sockaddr *samask); 196int scan_tree(struct dirlist *, struct sockaddr *); 197static void usage(void); 198int xdr_dir(XDR *, char *); 199int xdr_explist(XDR *, caddr_t); 200int xdr_explist_brief(XDR *, caddr_t); 201int xdr_fhs(XDR *, caddr_t); 202int xdr_mlist(XDR *, caddr_t); 203void terminate(int); 204 205struct exportlist *exphead; 206struct mountlist *mlhead; 207struct grouplist *grphead; 208char exname[MAXPATHLEN]; 209struct xucred def_anon = { 210 XUCRED_VERSION, 211 (uid_t)-2, 212 1, 213 { (gid_t)-2 }, 214 NULL 215}; 216int force_v2 = 0; 217int resvport_only = 1; 218int dir_only = 1; 219int dolog = 0; 220int got_sighup = 0; 221 222int opt_flags; 223static int have_v6 = 1; 224 225struct pidfh *pfh = NULL; 226/* Bits for opt_flags above */ 227#define OP_MAPROOT 0x01 228#define OP_MAPALL 0x02 229/* 0x4 free */ 230#define OP_MASK 0x08 231#define OP_NET 0x10 232#define OP_ALLDIRS 0x40 233#define OP_HAVEMASK 0x80 /* A mask was specified or inferred. */ 234#define OP_QUIET 0x100 235#define OP_MASKLEN 0x200 236 237#ifdef DEBUG 238int debug = 1; 239void SYSLOG(int, const char *, ...) __printflike(2, 3); 240#define syslog SYSLOG 241#else 242int debug = 0; 243#endif 244 245/* 246 * Mountd server for NFS mount protocol as described in: 247 * NFS: Network File System Protocol Specification, RFC1094, Appendix A 248 * The optional arguments are the exports file name 249 * default: _PATH_EXPORTS 250 * and "-n" to allow nonroot mount. 251 */ 252int 253main(argc, argv) 254 int argc; 255 char **argv; 256{ 257 fd_set readfds; 258 struct sockaddr_in sin; 259 struct sockaddr_in6 sin6; 260 char *endptr; 261 SVCXPRT *udptransp, *tcptransp, *udp6transp, *tcp6transp; 262 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 263 pid_t otherpid; 264 int udpsock, tcpsock, udp6sock, tcp6sock; 265 int xcreated = 0, s; 266 int maxrec = RPC_MAXDATASIZE; 267 int one = 1; 268 int c, r; 269 in_port_t svcport = 0; 270 271 udp6conf = tcp6conf = NULL; 272 udp6sock = tcp6sock = 0; 273 274 /* Check that another mountd isn't already running. */ 275 pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &otherpid); 276 if (pfh == NULL) { 277 if (errno == EEXIST) 278 errx(1, "mountd already running, pid: %d.", otherpid); 279 warn("cannot open or create pidfile"); 280 } 281 282 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 283 if (s < 0) 284 have_v6 = 0; 285 else 286 close(s); 287 if (modfind("nfsserver") < 0) { 288 /* Not present in kernel, try loading it */ 289 if (kldload("nfsserver") < 0 || modfind("nfsserver") < 0) 290 errx(1, "NFS server is not available or loadable"); 291 } 292 293 while ((c = getopt(argc, argv, "2dlnp:r")) != -1) 294 switch (c) { 295 case '2': 296 force_v2 = 1; 297 break; 298 case 'n': 299 resvport_only = 0; 300 break; 301 case 'r': 302 dir_only = 0; 303 break; 304 case 'd': 305 debug = debug ? 0 : 1; 306 break; 307 case 'l': 308 dolog = 1; 309 break; 310 case 'p': 311 endptr = NULL; 312 svcport = (in_port_t)strtoul(optarg, &endptr, 10); 313 if (endptr == NULL || *endptr != '\0' || 314 svcport == 0 || svcport >= IPPORT_MAX) 315 usage(); 316 break; 317 default: 318 usage(); 319 }; 320 argc -= optind; 321 argv += optind; 322 grphead = (struct grouplist *)NULL; 323 exphead = (struct exportlist *)NULL; 324 mlhead = (struct mountlist *)NULL; 325 if (argc == 1) { 326 strncpy(exname, *argv, MAXPATHLEN-1); 327 exname[MAXPATHLEN-1] = '\0'; 328 } else 329 strcpy(exname, _PATH_EXPORTS); 330 openlog("mountd", LOG_PID, LOG_DAEMON); 331 if (debug) 332 warnx("getting export list"); 333 get_exportlist(); 334 if (debug) 335 warnx("getting mount list"); 336 get_mountlist(); 337 if (debug) 338 warnx("here we go"); 339 if (debug == 0) { 340 daemon(0, 0); 341 signal(SIGINT, SIG_IGN); 342 signal(SIGQUIT, SIG_IGN); 343 } 344 signal(SIGHUP, huphandler); 345 signal(SIGTERM, terminate); 346 347 pidfile_write(pfh); 348 349 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 350 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 351 udpsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 352 tcpsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); 353 udpconf = getnetconfigent("udp"); 354 tcpconf = getnetconfigent("tcp"); 355 356 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 357 358 if (!have_v6) 359 goto skip_v6; 360 udp6sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 361 tcp6sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP); 362 /* 363 * We're doing host-based access checks here, so don't allow 364 * v4-in-v6 to confuse things. The kernel will disable it 365 * by default on NFS sockets too. 366 */ 367 if (udp6sock != -1 && setsockopt(udp6sock, IPPROTO_IPV6, 368 IPV6_V6ONLY, &one, sizeof one) < 0) { 369 syslog(LOG_ERR, "can't disable v4-in-v6 on UDP socket"); 370 exit(1); 371 } 372 if (tcp6sock != -1 && setsockopt(tcp6sock, IPPROTO_IPV6, 373 IPV6_V6ONLY, &one, sizeof one) < 0) { 374 syslog(LOG_ERR, "can't disable v4-in-v6 on TCP socket"); 375 exit(1); 376 } 377 udp6conf = getnetconfigent("udp6"); 378 tcp6conf = getnetconfigent("tcp6"); 379 380skip_v6: 381 if (!resvport_only) { 382 if (sysctlbyname("vfs.nfsrv.nfs_privport", NULL, NULL, 383 &resvport_only, sizeof(resvport_only)) != 0 && 384 errno != ENOENT) { 385 syslog(LOG_ERR, "sysctl: %m"); 386 exit(1); 387 } 388 } 389 if (svcport != 0) { 390 bzero(&sin, sizeof(struct sockaddr_in)); 391 sin.sin_len = sizeof(struct sockaddr_in); 392 sin.sin_family = AF_INET; 393 sin.sin_port = htons(svcport); 394 395 bzero(&sin6, sizeof(struct sockaddr_in6)); 396 sin6.sin6_len = sizeof(struct sockaddr_in6); 397 sin6.sin6_family = AF_INET6; 398 sin6.sin6_port = htons(svcport); 399 } 400 if (udpsock != -1 && udpconf != NULL) { 401 if (svcport != 0) { 402 r = bindresvport(udpsock, &sin); 403 if (r != 0) { 404 syslog(LOG_ERR, "bindresvport: %m"); 405 exit(1); 406 } 407 } else 408 (void)bindresvport(udpsock, NULL); 409 udptransp = svc_dg_create(udpsock, 0, 0); 410 if (udptransp != NULL) { 411 if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER1, 412 mntsrv, udpconf)) 413 syslog(LOG_WARNING, "can't register UDP RPCMNT_VER1 service"); 414 else 415 xcreated++; 416 if (!force_v2) { 417 if (!svc_reg(udptransp, RPCPROG_MNT, RPCMNT_VER3, 418 mntsrv, udpconf)) 419 syslog(LOG_WARNING, "can't register UDP RPCMNT_VER3 service"); 420 else 421 xcreated++; 422 } 423 } else 424 syslog(LOG_WARNING, "can't create UDP services"); 425 426 } 427 if (tcpsock != -1 && tcpconf != NULL) { 428 if (svcport != 0) { 429 r = bindresvport(tcpsock, &sin); 430 if (r != 0) { 431 syslog(LOG_ERR, "bindresvport: %m"); 432 exit(1); 433 } 434 } else 435 (void)bindresvport(tcpsock, NULL); 436 listen(tcpsock, SOMAXCONN); 437 tcptransp = svc_vc_create(tcpsock, RPC_MAXDATASIZE, RPC_MAXDATASIZE); 438 if (tcptransp != NULL) { 439 if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER1, 440 mntsrv, tcpconf)) 441 syslog(LOG_WARNING, "can't register TCP RPCMNT_VER1 service"); 442 else 443 xcreated++; 444 if (!force_v2) { 445 if (!svc_reg(tcptransp, RPCPROG_MNT, RPCMNT_VER3, 446 mntsrv, tcpconf)) 447 syslog(LOG_WARNING, "can't register TCP RPCMNT_VER3 service"); 448 else 449 xcreated++; 450 } 451 } else 452 syslog(LOG_WARNING, "can't create TCP service"); 453 454 } 455 if (have_v6 && udp6sock != -1 && udp6conf != NULL) { 456 if (svcport != 0) { 457 r = bindresvport_sa(udp6sock, 458 (struct sockaddr *)&sin6); 459 if (r != 0) { 460 syslog(LOG_ERR, "bindresvport_sa: %m"); 461 exit(1); 462 } 463 } else 464 (void)bindresvport_sa(udp6sock, NULL); 465 udp6transp = svc_dg_create(udp6sock, 0, 0); 466 if (udp6transp != NULL) { 467 if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER1, 468 mntsrv, udp6conf)) 469 syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER1 service"); 470 else 471 xcreated++; 472 if (!force_v2) { 473 if (!svc_reg(udp6transp, RPCPROG_MNT, RPCMNT_VER3, 474 mntsrv, udp6conf)) 475 syslog(LOG_WARNING, "can't register UDP6 RPCMNT_VER3 service"); 476 else 477 xcreated++; 478 } 479 } else 480 syslog(LOG_WARNING, "can't create UDP6 service"); 481 482 } 483 if (have_v6 && tcp6sock != -1 && tcp6conf != NULL) { 484 if (svcport != 0) { 485 r = bindresvport_sa(tcp6sock, 486 (struct sockaddr *)&sin6); 487 if (r != 0) { 488 syslog(LOG_ERR, "bindresvport_sa: %m"); 489 exit(1); 490 } 491 } else 492 (void)bindresvport_sa(tcp6sock, NULL); 493 listen(tcp6sock, SOMAXCONN); 494 tcp6transp = svc_vc_create(tcp6sock, RPC_MAXDATASIZE, RPC_MAXDATASIZE); 495 if (tcp6transp != NULL) { 496 if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER1, 497 mntsrv, tcp6conf)) 498 syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER1 service"); 499 else 500 xcreated++; 501 if (!force_v2) { 502 if (!svc_reg(tcp6transp, RPCPROG_MNT, RPCMNT_VER3, 503 mntsrv, tcp6conf)) 504 syslog(LOG_WARNING, "can't register TCP6 RPCMNT_VER3 service"); 505 else 506 xcreated++; 507 } 508 } else 509 syslog(LOG_WARNING, "can't create TCP6 service"); 510 511 } 512 if (xcreated == 0) { 513 syslog(LOG_ERR, "could not create any services"); 514 exit(1); 515 } 516 517 /* Expand svc_run() here so that we can call get_exportlist(). */ 518 for (;;) { 519 if (got_sighup) { 520 get_exportlist(); 521 got_sighup = 0; 522 } 523 readfds = svc_fdset; 524 switch (select(svc_maxfd + 1, &readfds, NULL, NULL, NULL)) { 525 case -1: 526 if (errno == EINTR) 527 continue; 528 syslog(LOG_ERR, "mountd died: select: %m"); 529 exit(1); 530 case 0: 531 continue; 532 default: 533 svc_getreqset(&readfds); 534 } 535 } 536} 537 538static void 539usage() 540{ 541 fprintf(stderr, 542 "usage: mountd [-2] [-d] [-l] [-n] [-p <port>] [-r] " 543 "[export_file]\n"); 544 exit(1); 545} 546 547/* 548 * The mount rpc service 549 */ 550void 551mntsrv(rqstp, transp) 552 struct svc_req *rqstp; 553 SVCXPRT *transp; 554{ 555 struct exportlist *ep; 556 struct dirlist *dp; 557 struct fhreturn fhr; 558 struct stat stb; 559 struct statfs fsb; 560 char host[NI_MAXHOST], numerichost[NI_MAXHOST]; 561 int lookup_failed = 1; 562 struct sockaddr *saddr; 563 u_short sport; 564 char rpcpath[RPCMNT_PATHLEN + 1], dirpath[MAXPATHLEN]; 565 int bad = 0, defset, hostset; 566 sigset_t sighup_mask; 567 568 sigemptyset(&sighup_mask); 569 sigaddset(&sighup_mask, SIGHUP); 570 saddr = svc_getrpccaller(transp)->buf; 571 switch (saddr->sa_family) { 572 case AF_INET6: 573 sport = ntohs(((struct sockaddr_in6 *)saddr)->sin6_port); 574 break; 575 case AF_INET: 576 sport = ntohs(((struct sockaddr_in *)saddr)->sin_port); 577 break; 578 default: 579 syslog(LOG_ERR, "request from unknown address family"); 580 return; 581 } 582 lookup_failed = getnameinfo(saddr, saddr->sa_len, host, sizeof host, 583 NULL, 0, 0); 584 getnameinfo(saddr, saddr->sa_len, numerichost, 585 sizeof numerichost, NULL, 0, NI_NUMERICHOST); 586 switch (rqstp->rq_proc) { 587 case NULLPROC: 588 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, NULL)) 589 syslog(LOG_ERR, "can't send reply"); 590 return; 591 case RPCMNT_MOUNT: 592 if (sport >= IPPORT_RESERVED && resvport_only) { 593 syslog(LOG_NOTICE, 594 "mount request from %s from unprivileged port", 595 numerichost); 596 svcerr_weakauth(transp); 597 return; 598 } 599 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 600 syslog(LOG_NOTICE, "undecodable mount request from %s", 601 numerichost); 602 svcerr_decode(transp); 603 return; 604 } 605 606 /* 607 * Get the real pathname and make sure it is a directory 608 * or a regular file if the -r option was specified 609 * and it exists. 610 */ 611 if (realpath(rpcpath, dirpath) == NULL || 612 stat(dirpath, &stb) < 0 || 613 (!S_ISDIR(stb.st_mode) && 614 (dir_only || !S_ISREG(stb.st_mode))) || 615 statfs(dirpath, &fsb) < 0) { 616 chdir("/"); /* Just in case realpath doesn't */ 617 syslog(LOG_NOTICE, 618 "mount request from %s for non existent path %s", 619 numerichost, dirpath); 620 if (debug) 621 warnx("stat failed on %s", dirpath); 622 bad = ENOENT; /* We will send error reply later */ 623 } 624 625 /* Check in the exports list */ 626 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 627 ep = ex_search(&fsb.f_fsid); 628 hostset = defset = 0; 629 if (ep && (chk_host(ep->ex_defdir, saddr, &defset, &hostset) || 630 ((dp = dirp_search(ep->ex_dirl, dirpath)) && 631 chk_host(dp, saddr, &defset, &hostset)) || 632 (defset && scan_tree(ep->ex_defdir, saddr) == 0 && 633 scan_tree(ep->ex_dirl, saddr) == 0))) { 634 if (bad) { 635 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 636 (caddr_t)&bad)) 637 syslog(LOG_ERR, "can't send reply"); 638 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 639 return; 640 } 641 if (hostset & DP_HOSTSET) 642 fhr.fhr_flag = hostset; 643 else 644 fhr.fhr_flag = defset; 645 fhr.fhr_vers = rqstp->rq_vers; 646 /* Get the file handle */ 647 memset(&fhr.fhr_fh, 0, sizeof(nfsfh_t)); 648 if (getfh(dirpath, (fhandle_t *)&fhr.fhr_fh) < 0) { 649 bad = errno; 650 syslog(LOG_ERR, "can't get fh for %s", dirpath); 651 if (!svc_sendreply(transp, (xdrproc_t)xdr_long, 652 (caddr_t)&bad)) 653 syslog(LOG_ERR, "can't send reply"); 654 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 655 return; 656 } 657 if (!svc_sendreply(transp, (xdrproc_t)xdr_fhs, 658 (caddr_t)&fhr)) 659 syslog(LOG_ERR, "can't send reply"); 660 if (!lookup_failed) 661 add_mlist(host, dirpath); 662 else 663 add_mlist(numerichost, dirpath); 664 if (debug) 665 warnx("mount successful"); 666 if (dolog) 667 syslog(LOG_NOTICE, 668 "mount request succeeded from %s for %s", 669 numerichost, dirpath); 670 } else { 671 bad = EACCES; 672 syslog(LOG_NOTICE, 673 "mount request denied from %s for %s", 674 numerichost, dirpath); 675 } 676 677 if (bad && !svc_sendreply(transp, (xdrproc_t)xdr_long, 678 (caddr_t)&bad)) 679 syslog(LOG_ERR, "can't send reply"); 680 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 681 return; 682 case RPCMNT_DUMP: 683 if (!svc_sendreply(transp, (xdrproc_t)xdr_mlist, (caddr_t)NULL)) 684 syslog(LOG_ERR, "can't send reply"); 685 else if (dolog) 686 syslog(LOG_NOTICE, 687 "dump request succeeded from %s", 688 numerichost); 689 return; 690 case RPCMNT_UMOUNT: 691 if (sport >= IPPORT_RESERVED && resvport_only) { 692 syslog(LOG_NOTICE, 693 "umount request from %s from unprivileged port", 694 numerichost); 695 svcerr_weakauth(transp); 696 return; 697 } 698 if (!svc_getargs(transp, (xdrproc_t)xdr_dir, rpcpath)) { 699 syslog(LOG_NOTICE, "undecodable umount request from %s", 700 numerichost); 701 svcerr_decode(transp); 702 return; 703 } 704 if (realpath(rpcpath, dirpath) == NULL) { 705 syslog(LOG_NOTICE, "umount request from %s " 706 "for non existent path %s", 707 numerichost, dirpath); 708 } 709 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL)) 710 syslog(LOG_ERR, "can't send reply"); 711 if (!lookup_failed) 712 del_mlist(host, dirpath); 713 del_mlist(numerichost, dirpath); 714 if (dolog) 715 syslog(LOG_NOTICE, 716 "umount request succeeded from %s for %s", 717 numerichost, dirpath); 718 return; 719 case RPCMNT_UMNTALL: 720 if (sport >= IPPORT_RESERVED && resvport_only) { 721 syslog(LOG_NOTICE, 722 "umountall request from %s from unprivileged port", 723 numerichost); 724 svcerr_weakauth(transp); 725 return; 726 } 727 if (!svc_sendreply(transp, (xdrproc_t)xdr_void, (caddr_t)NULL)) 728 syslog(LOG_ERR, "can't send reply"); 729 if (!lookup_failed) 730 del_mlist(host, NULL); 731 del_mlist(numerichost, NULL); 732 if (dolog) 733 syslog(LOG_NOTICE, 734 "umountall request succeeded from %s", 735 numerichost); 736 return; 737 case RPCMNT_EXPORT: 738 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist, (caddr_t)NULL)) 739 if (!svc_sendreply(transp, (xdrproc_t)xdr_explist_brief, 740 (caddr_t)NULL)) 741 syslog(LOG_ERR, "can't send reply"); 742 if (dolog) 743 syslog(LOG_NOTICE, 744 "export request succeeded from %s", 745 numerichost); 746 return; 747 default: 748 svcerr_noproc(transp); 749 return; 750 } 751} 752 753/* 754 * Xdr conversion for a dirpath string 755 */ 756int 757xdr_dir(xdrsp, dirp) 758 XDR *xdrsp; 759 char *dirp; 760{ 761 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 762} 763 764/* 765 * Xdr routine to generate file handle reply 766 */ 767int 768xdr_fhs(xdrsp, cp) 769 XDR *xdrsp; 770 caddr_t cp; 771{ 772 struct fhreturn *fhrp = (struct fhreturn *)cp; 773 u_long ok = 0, len, auth; 774 775 if (!xdr_long(xdrsp, &ok)) 776 return (0); 777 switch (fhrp->fhr_vers) { 778 case 1: 779 return (xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, NFSX_V2FH)); 780 case 3: 781 len = NFSX_V3FH; 782 if (!xdr_long(xdrsp, &len)) 783 return (0); 784 if (!xdr_opaque(xdrsp, (caddr_t)&fhrp->fhr_fh, len)) 785 return (0); 786 auth = RPCAUTH_UNIX; 787 len = 1; 788 if (!xdr_long(xdrsp, &len)) 789 return (0); 790 return (xdr_long(xdrsp, &auth)); 791 }; 792 return (0); 793} 794 795int 796xdr_mlist(xdrsp, cp) 797 XDR *xdrsp; 798 caddr_t cp; 799{ 800 struct mountlist *mlp; 801 int true = 1; 802 int false = 0; 803 char *strp; 804 805 mlp = mlhead; 806 while (mlp) { 807 if (!xdr_bool(xdrsp, &true)) 808 return (0); 809 strp = &mlp->ml_host[0]; 810 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN)) 811 return (0); 812 strp = &mlp->ml_dirp[0]; 813 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 814 return (0); 815 mlp = mlp->ml_next; 816 } 817 if (!xdr_bool(xdrsp, &false)) 818 return (0); 819 return (1); 820} 821 822/* 823 * Xdr conversion for export list 824 */ 825int 826xdr_explist_common(xdrsp, cp, brief) 827 XDR *xdrsp; 828 caddr_t cp; 829 int brief; 830{ 831 struct exportlist *ep; 832 int false = 0; 833 int putdef; 834 sigset_t sighup_mask; 835 836 sigemptyset(&sighup_mask); 837 sigaddset(&sighup_mask, SIGHUP); 838 sigprocmask(SIG_BLOCK, &sighup_mask, NULL); 839 ep = exphead; 840 while (ep) { 841 putdef = 0; 842 if (put_exlist(ep->ex_dirl, xdrsp, ep->ex_defdir, 843 &putdef, brief)) 844 goto errout; 845 if (ep->ex_defdir && putdef == 0 && 846 put_exlist(ep->ex_defdir, xdrsp, (struct dirlist *)NULL, 847 &putdef, brief)) 848 goto errout; 849 ep = ep->ex_next; 850 } 851 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 852 if (!xdr_bool(xdrsp, &false)) 853 return (0); 854 return (1); 855errout: 856 sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL); 857 return (0); 858} 859 860/* 861 * Called from xdr_explist() to traverse the tree and export the 862 * directory paths. 863 */ 864int 865put_exlist(dp, xdrsp, adp, putdefp, brief) 866 struct dirlist *dp; 867 XDR *xdrsp; 868 struct dirlist *adp; 869 int *putdefp; 870 int brief; 871{ 872 struct grouplist *grp; 873 struct hostlist *hp; 874 int true = 1; 875 int false = 0; 876 int gotalldir = 0; 877 char *strp; 878 879 if (dp) { 880 if (put_exlist(dp->dp_left, xdrsp, adp, putdefp, brief)) 881 return (1); 882 if (!xdr_bool(xdrsp, &true)) 883 return (1); 884 strp = dp->dp_dirp; 885 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 886 return (1); 887 if (adp && !strcmp(dp->dp_dirp, adp->dp_dirp)) { 888 gotalldir = 1; 889 *putdefp = 1; 890 } 891 if (brief) { 892 if (!xdr_bool(xdrsp, &true)) 893 return (1); 894 strp = "(...)"; 895 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 896 return (1); 897 } else if ((dp->dp_flag & DP_DEFSET) == 0 && 898 (gotalldir == 0 || (adp->dp_flag & DP_DEFSET) == 0)) { 899 hp = dp->dp_hosts; 900 while (hp) { 901 grp = hp->ht_grp; 902 if (grp->gr_type == GT_HOST) { 903 if (!xdr_bool(xdrsp, &true)) 904 return (1); 905 strp = grp->gr_ptr.gt_addrinfo->ai_canonname; 906 if (!xdr_string(xdrsp, &strp, 907 RPCMNT_NAMELEN)) 908 return (1); 909 } else if (grp->gr_type == GT_NET) { 910 if (!xdr_bool(xdrsp, &true)) 911 return (1); 912 strp = grp->gr_ptr.gt_net.nt_name; 913 if (!xdr_string(xdrsp, &strp, 914 RPCMNT_NAMELEN)) 915 return (1); 916 } 917 hp = hp->ht_next; 918 if (gotalldir && hp == (struct hostlist *)NULL) { 919 hp = adp->dp_hosts; 920 gotalldir = 0; 921 } 922 } 923 } 924 if (!xdr_bool(xdrsp, &false)) 925 return (1); 926 if (put_exlist(dp->dp_right, xdrsp, adp, putdefp, brief)) 927 return (1); 928 } 929 return (0); 930} 931 932int 933xdr_explist(xdrsp, cp) 934 XDR *xdrsp; 935 caddr_t cp; 936{ 937 938 return xdr_explist_common(xdrsp, cp, 0); 939} 940 941int 942xdr_explist_brief(xdrsp, cp) 943 XDR *xdrsp; 944 caddr_t cp; 945{ 946 947 return xdr_explist_common(xdrsp, cp, 1); 948} 949 950char *line; 951int linesize; 952FILE *exp_file; 953 954/* 955 * Get the export list 956 */ 957void 958get_exportlist() 959{ 960 struct exportlist *ep, *ep2; 961 struct grouplist *grp, *tgrp; 962 struct exportlist **epp; 963 struct export_args export; 964 struct dirlist *dirhead; 965 struct iovec *iov; 966 struct statfs fsb, *fsp; 967 struct xucred anon; 968 char *cp, *endcp, *dirp, *hst, *usr, *dom, savedc; 969 char errmsg[255]; 970 int len, has_host, exflags, got_nondir, dirplen, num, i, netgrp; 971 int iovlen; 972 973 bzero(&export, sizeof(export)); 974 export.ex_flags = MNT_DELEXPORT; 975 dirp = NULL; 976 dirplen = 0; 977 iov = NULL; 978 iovlen = 0; 979 bzero(errmsg, sizeof(errmsg)); 980 981 /* 982 * First, get rid of the old list 983 */ 984 ep = exphead; 985 while (ep) { 986 ep2 = ep; 987 ep = ep->ex_next; 988 free_exp(ep2); 989 } 990 exphead = (struct exportlist *)NULL; 991 992 grp = grphead; 993 while (grp) { 994 tgrp = grp; 995 grp = grp->gr_next; 996 free_grp(tgrp); 997 } 998 grphead = (struct grouplist *)NULL; 999 1000 /* 1001 * And delete exports that are in the kernel for all local 1002 * filesystems. 1003 * XXX: Should know how to handle all local exportable filesystems 1004 * instead of just "ufs". 1005 */ 1006 num = getmntinfo(&fsp, MNT_NOWAIT); 1007 1008 if (num > 0) { 1009 build_iovec(&iov, &iovlen, "fstype", NULL, 0); 1010 build_iovec(&iov, &iovlen, "fspath", NULL, 0); 1011 build_iovec(&iov, &iovlen, "from", NULL, 0); 1012 build_iovec(&iov, &iovlen, "update", NULL, 0); 1013 build_iovec(&iov, &iovlen, "export", &export, sizeof(export)); 1014 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg)); 1015 } 1016 1017 for (i = 0; i < num; i++) { 1018 iov[1].iov_base = fsp->f_fstypename; 1019 iov[1].iov_len = strlen(fsp->f_fstypename) + 1; 1020 iov[3].iov_base = fsp->f_mntonname; 1021 iov[3].iov_len = strlen(fsp->f_mntonname) + 1; 1022 iov[5].iov_base = fsp->f_mntfromname; 1023 iov[5].iov_len = strlen(fsp->f_mntfromname) + 1; 1024 1025 /* 1026 * Kick out MNT_ROOTFS. It should not be passed from 1027 * userland to kernel. It should only be used 1028 * internally in the kernel. 1029 */ 1030 if (fsp->f_flags & MNT_ROOTFS) { 1031 fsp->f_flags &= ~MNT_ROOTFS; 1032 } 1033 1034 if (nmount(iov, iovlen, fsp->f_flags) < 0 && 1035 errno != ENOENT && errno != ENOTSUP) { 1036 syslog(LOG_ERR, 1037 "can't delete exports for %s: %m %s", 1038 fsp->f_mntonname, errmsg); 1039 } 1040 fsp++; 1041 } 1042 1043 if (iov != NULL) { 1044 /* Free strings allocated by strdup() in getmntopts.c */ 1045 free(iov[0].iov_base); /* fstype */ 1046 free(iov[2].iov_base); /* fspath */ 1047 free(iov[4].iov_base); /* from */ 1048 free(iov[6].iov_base); /* update */ 1049 free(iov[8].iov_base); /* export */ 1050 free(iov[10].iov_base); /* errmsg */ 1051 1052 /* free iov, allocated by realloc() */ 1053 free(iov); 1054 iovlen = 0; 1055 } 1056 1057 /* 1058 * Read in the exports file and build the list, calling 1059 * nmount() as we go along to push the export rules into the kernel. 1060 */ 1061 if ((exp_file = fopen(exname, "r")) == NULL) { 1062 syslog(LOG_ERR, "can't open %s", exname); 1063 exit(2); 1064 } 1065 dirhead = (struct dirlist *)NULL; 1066 while (get_line()) { 1067 if (debug) 1068 warnx("got line %s", line); 1069 cp = line; 1070 nextfield(&cp, &endcp); 1071 if (*cp == '#') 1072 goto nextline; 1073 1074 /* 1075 * Set defaults. 1076 */ 1077 has_host = FALSE; 1078 anon = def_anon; 1079 exflags = MNT_EXPORTED; 1080 got_nondir = 0; 1081 opt_flags = 0; 1082 ep = (struct exportlist *)NULL; 1083 1084 /* 1085 * Create new exports list entry 1086 */ 1087 len = endcp-cp; 1088 tgrp = grp = get_grp(); 1089 while (len > 0) { 1090 if (len > RPCMNT_NAMELEN) { 1091 getexp_err(ep, tgrp); 1092 goto nextline; 1093 } 1094 if (*cp == '-') { 1095 if (ep == (struct exportlist *)NULL) { 1096 getexp_err(ep, tgrp); 1097 goto nextline; 1098 } 1099 if (debug) 1100 warnx("doing opt %s", cp); 1101 got_nondir = 1; 1102 if (do_opt(&cp, &endcp, ep, grp, &has_host, 1103 &exflags, &anon)) { 1104 getexp_err(ep, tgrp); 1105 goto nextline; 1106 } 1107 } else if (*cp == '/') { 1108 savedc = *endcp; 1109 *endcp = '\0'; 1110 if (check_dirpath(cp) && 1111 statfs(cp, &fsb) >= 0) { 1112 if (got_nondir) { 1113 syslog(LOG_ERR, "dirs must be first"); 1114 getexp_err(ep, tgrp); 1115 goto nextline; 1116 } 1117 if (ep) { 1118 if (ep->ex_fs.val[0] != fsb.f_fsid.val[0] || 1119 ep->ex_fs.val[1] != fsb.f_fsid.val[1]) { 1120 getexp_err(ep, tgrp); 1121 goto nextline; 1122 } 1123 } else { 1124 /* 1125 * See if this directory is already 1126 * in the list. 1127 */ 1128 ep = ex_search(&fsb.f_fsid); 1129 if (ep == (struct exportlist *)NULL) { 1130 ep = get_exp(); 1131 ep->ex_fs = fsb.f_fsid; 1132 ep->ex_fsdir = (char *) 1133 malloc(strlen(fsb.f_mntonname) + 1); 1134 if (ep->ex_fsdir) 1135 strcpy(ep->ex_fsdir, 1136 fsb.f_mntonname); 1137 else 1138 out_of_mem(); 1139 if (debug) 1140 warnx("making new ep fs=0x%x,0x%x", 1141 fsb.f_fsid.val[0], 1142 fsb.f_fsid.val[1]); 1143 } else if (debug) 1144 warnx("found ep fs=0x%x,0x%x", 1145 fsb.f_fsid.val[0], 1146 fsb.f_fsid.val[1]); 1147 } 1148 1149 /* 1150 * Add dirpath to export mount point. 1151 */ 1152 dirp = add_expdir(&dirhead, cp, len); 1153 dirplen = len; 1154 } else { 1155 getexp_err(ep, tgrp); 1156 goto nextline; 1157 } 1158 *endcp = savedc; 1159 } else { 1160 savedc = *endcp; 1161 *endcp = '\0'; 1162 got_nondir = 1; 1163 if (ep == (struct exportlist *)NULL) { 1164 getexp_err(ep, tgrp); 1165 goto nextline; 1166 } 1167 1168 /* 1169 * Get the host or netgroup. 1170 */ 1171 setnetgrent(cp); 1172 netgrp = getnetgrent(&hst, &usr, &dom); 1173 do { 1174 if (has_host) { 1175 grp->gr_next = get_grp(); 1176 grp = grp->gr_next; 1177 } 1178 if (netgrp) { 1179 if (hst == 0) { 1180 syslog(LOG_ERR, 1181 "null hostname in netgroup %s, skipping", cp); 1182 grp->gr_type = GT_IGNORE; 1183 } else if (get_host(hst, grp, tgrp)) { 1184 syslog(LOG_ERR, 1185 "bad host %s in netgroup %s, skipping", hst, cp); 1186 grp->gr_type = GT_IGNORE; 1187 } 1188 } else if (get_host(cp, grp, tgrp)) { 1189 syslog(LOG_ERR, "bad host %s, skipping", cp); 1190 grp->gr_type = GT_IGNORE; 1191 } 1192 has_host = TRUE; 1193 } while (netgrp && getnetgrent(&hst, &usr, &dom)); 1194 endnetgrent(); 1195 *endcp = savedc; 1196 } 1197 cp = endcp; 1198 nextfield(&cp, &endcp); 1199 len = endcp - cp; 1200 } 1201 if (check_options(dirhead)) { 1202 getexp_err(ep, tgrp); 1203 goto nextline; 1204 } 1205 if (!has_host) { 1206 grp->gr_type = GT_DEFAULT; 1207 if (debug) 1208 warnx("adding a default entry"); 1209 1210 /* 1211 * Don't allow a network export coincide with a list of 1212 * host(s) on the same line. 1213 */ 1214 } else if ((opt_flags & OP_NET) && tgrp->gr_next) { 1215 syslog(LOG_ERR, "network/host conflict"); 1216 getexp_err(ep, tgrp); 1217 goto nextline; 1218 1219 /* 1220 * If an export list was specified on this line, make sure 1221 * that we have at least one valid entry, otherwise skip it. 1222 */ 1223 } else { 1224 grp = tgrp; 1225 while (grp && grp->gr_type == GT_IGNORE) 1226 grp = grp->gr_next; 1227 if (! grp) { 1228 getexp_err(ep, tgrp); 1229 goto nextline; 1230 } 1231 } 1232 1233 /* 1234 * Loop through hosts, pushing the exports into the kernel. 1235 * After loop, tgrp points to the start of the list and 1236 * grp points to the last entry in the list. 1237 */ 1238 grp = tgrp; 1239 do { 1240 if (do_mount(ep, grp, exflags, &anon, dirp, dirplen, 1241 &fsb)) { 1242 getexp_err(ep, tgrp); 1243 goto nextline; 1244 } 1245 } while (grp->gr_next && (grp = grp->gr_next)); 1246 1247 /* 1248 * Success. Update the data structures. 1249 */ 1250 if (has_host) { 1251 hang_dirp(dirhead, tgrp, ep, opt_flags); 1252 grp->gr_next = grphead; 1253 grphead = tgrp; 1254 } else { 1255 hang_dirp(dirhead, (struct grouplist *)NULL, ep, 1256 opt_flags); 1257 free_grp(grp); 1258 } 1259 dirhead = (struct dirlist *)NULL; 1260 if ((ep->ex_flag & EX_LINKED) == 0) { 1261 ep2 = exphead; 1262 epp = &exphead; 1263 1264 /* 1265 * Insert in the list in alphabetical order. 1266 */ 1267 while (ep2 && strcmp(ep2->ex_fsdir, ep->ex_fsdir) < 0) { 1268 epp = &ep2->ex_next; 1269 ep2 = ep2->ex_next; 1270 } 1271 if (ep2) 1272 ep->ex_next = ep2; 1273 *epp = ep; 1274 ep->ex_flag |= EX_LINKED; 1275 } 1276nextline: 1277 if (dirhead) { 1278 free_dir(dirhead); 1279 dirhead = (struct dirlist *)NULL; 1280 } 1281 } 1282 fclose(exp_file); 1283} 1284 1285/* 1286 * Allocate an export list element 1287 */ 1288struct exportlist * 1289get_exp() 1290{ 1291 struct exportlist *ep; 1292 1293 ep = (struct exportlist *)malloc(sizeof (struct exportlist)); 1294 if (ep == (struct exportlist *)NULL) 1295 out_of_mem(); 1296 memset(ep, 0, sizeof(struct exportlist)); 1297 return (ep); 1298} 1299 1300/* 1301 * Allocate a group list element 1302 */ 1303struct grouplist * 1304get_grp() 1305{ 1306 struct grouplist *gp; 1307 1308 gp = (struct grouplist *)malloc(sizeof (struct grouplist)); 1309 if (gp == (struct grouplist *)NULL) 1310 out_of_mem(); 1311 memset(gp, 0, sizeof(struct grouplist)); 1312 return (gp); 1313} 1314 1315/* 1316 * Clean up upon an error in get_exportlist(). 1317 */ 1318void 1319getexp_err(ep, grp) 1320 struct exportlist *ep; 1321 struct grouplist *grp; 1322{ 1323 struct grouplist *tgrp; 1324 1325 if (!(opt_flags & OP_QUIET)) 1326 syslog(LOG_ERR, "bad exports list line %s", line); 1327 if (ep && (ep->ex_flag & EX_LINKED) == 0) 1328 free_exp(ep); 1329 while (grp) { 1330 tgrp = grp; 1331 grp = grp->gr_next; 1332 free_grp(tgrp); 1333 } 1334} 1335 1336/* 1337 * Search the export list for a matching fs. 1338 */ 1339struct exportlist * 1340ex_search(fsid) 1341 fsid_t *fsid; 1342{ 1343 struct exportlist *ep; 1344 1345 ep = exphead; 1346 while (ep) { 1347 if (ep->ex_fs.val[0] == fsid->val[0] && 1348 ep->ex_fs.val[1] == fsid->val[1]) 1349 return (ep); 1350 ep = ep->ex_next; 1351 } 1352 return (ep); 1353} 1354 1355/* 1356 * Add a directory path to the list. 1357 */ 1358char * 1359add_expdir(dpp, cp, len) 1360 struct dirlist **dpp; 1361 char *cp; 1362 int len; 1363{ 1364 struct dirlist *dp; 1365 1366 dp = (struct dirlist *)malloc(sizeof (struct dirlist) + len); 1367 if (dp == (struct dirlist *)NULL) 1368 out_of_mem(); 1369 dp->dp_left = *dpp; 1370 dp->dp_right = (struct dirlist *)NULL; 1371 dp->dp_flag = 0; 1372 dp->dp_hosts = (struct hostlist *)NULL; 1373 strcpy(dp->dp_dirp, cp); 1374 *dpp = dp; 1375 return (dp->dp_dirp); 1376} 1377 1378/* 1379 * Hang the dir list element off the dirpath binary tree as required 1380 * and update the entry for host. 1381 */ 1382void 1383hang_dirp(dp, grp, ep, flags) 1384 struct dirlist *dp; 1385 struct grouplist *grp; 1386 struct exportlist *ep; 1387 int flags; 1388{ 1389 struct hostlist *hp; 1390 struct dirlist *dp2; 1391 1392 if (flags & OP_ALLDIRS) { 1393 if (ep->ex_defdir) 1394 free((caddr_t)dp); 1395 else 1396 ep->ex_defdir = dp; 1397 if (grp == (struct grouplist *)NULL) { 1398 ep->ex_defdir->dp_flag |= DP_DEFSET; 1399 } else while (grp) { 1400 hp = get_ht(); 1401 hp->ht_grp = grp; 1402 hp->ht_next = ep->ex_defdir->dp_hosts; 1403 ep->ex_defdir->dp_hosts = hp; 1404 grp = grp->gr_next; 1405 } 1406 } else { 1407 1408 /* 1409 * Loop through the directories adding them to the tree. 1410 */ 1411 while (dp) { 1412 dp2 = dp->dp_left; 1413 add_dlist(&ep->ex_dirl, dp, grp, flags); 1414 dp = dp2; 1415 } 1416 } 1417} 1418 1419/* 1420 * Traverse the binary tree either updating a node that is already there 1421 * for the new directory or adding the new node. 1422 */ 1423void 1424add_dlist(dpp, newdp, grp, flags) 1425 struct dirlist **dpp; 1426 struct dirlist *newdp; 1427 struct grouplist *grp; 1428 int flags; 1429{ 1430 struct dirlist *dp; 1431 struct hostlist *hp; 1432 int cmp; 1433 1434 dp = *dpp; 1435 if (dp) { 1436 cmp = strcmp(dp->dp_dirp, newdp->dp_dirp); 1437 if (cmp > 0) { 1438 add_dlist(&dp->dp_left, newdp, grp, flags); 1439 return; 1440 } else if (cmp < 0) { 1441 add_dlist(&dp->dp_right, newdp, grp, flags); 1442 return; 1443 } else 1444 free((caddr_t)newdp); 1445 } else { 1446 dp = newdp; 1447 dp->dp_left = (struct dirlist *)NULL; 1448 *dpp = dp; 1449 } 1450 if (grp) { 1451 1452 /* 1453 * Hang all of the host(s) off of the directory point. 1454 */ 1455 do { 1456 hp = get_ht(); 1457 hp->ht_grp = grp; 1458 hp->ht_next = dp->dp_hosts; 1459 dp->dp_hosts = hp; 1460 grp = grp->gr_next; 1461 } while (grp); 1462 } else { 1463 dp->dp_flag |= DP_DEFSET; 1464 } 1465} 1466 1467/* 1468 * Search for a dirpath on the export point. 1469 */ 1470struct dirlist * 1471dirp_search(dp, dirp) 1472 struct dirlist *dp; 1473 char *dirp; 1474{ 1475 int cmp; 1476 1477 if (dp) { 1478 cmp = strcmp(dp->dp_dirp, dirp); 1479 if (cmp > 0) 1480 return (dirp_search(dp->dp_left, dirp)); 1481 else if (cmp < 0) 1482 return (dirp_search(dp->dp_right, dirp)); 1483 else 1484 return (dp); 1485 } 1486 return (dp); 1487} 1488 1489/* 1490 * Scan for a host match in a directory tree. 1491 */ 1492int 1493chk_host(dp, saddr, defsetp, hostsetp) 1494 struct dirlist *dp; 1495 struct sockaddr *saddr; 1496 int *defsetp; 1497 int *hostsetp; 1498{ 1499 struct hostlist *hp; 1500 struct grouplist *grp; 1501 struct addrinfo *ai; 1502 1503 if (dp) { 1504 if (dp->dp_flag & DP_DEFSET) 1505 *defsetp = dp->dp_flag; 1506 hp = dp->dp_hosts; 1507 while (hp) { 1508 grp = hp->ht_grp; 1509 switch (grp->gr_type) { 1510 case GT_HOST: 1511 ai = grp->gr_ptr.gt_addrinfo; 1512 for (; ai; ai = ai->ai_next) { 1513 if (!sacmp(ai->ai_addr, saddr, NULL)) { 1514 *hostsetp = 1515 (hp->ht_flag | DP_HOSTSET); 1516 return (1); 1517 } 1518 } 1519 break; 1520 case GT_NET: 1521 if (!sacmp(saddr, (struct sockaddr *) 1522 &grp->gr_ptr.gt_net.nt_net, 1523 (struct sockaddr *) 1524 &grp->gr_ptr.gt_net.nt_mask)) { 1525 *hostsetp = (hp->ht_flag | DP_HOSTSET); 1526 return (1); 1527 } 1528 break; 1529 } 1530 hp = hp->ht_next; 1531 } 1532 } 1533 return (0); 1534} 1535 1536/* 1537 * Scan tree for a host that matches the address. 1538 */ 1539int 1540scan_tree(dp, saddr) 1541 struct dirlist *dp; 1542 struct sockaddr *saddr; 1543{ 1544 int defset, hostset; 1545 1546 if (dp) { 1547 if (scan_tree(dp->dp_left, saddr)) 1548 return (1); 1549 if (chk_host(dp, saddr, &defset, &hostset)) 1550 return (1); 1551 if (scan_tree(dp->dp_right, saddr)) 1552 return (1); 1553 } 1554 return (0); 1555} 1556 1557/* 1558 * Traverse the dirlist tree and free it up. 1559 */ 1560void 1561free_dir(dp) 1562 struct dirlist *dp; 1563{ 1564 1565 if (dp) { 1566 free_dir(dp->dp_left); 1567 free_dir(dp->dp_right); 1568 free_host(dp->dp_hosts); 1569 free((caddr_t)dp); 1570 } 1571} 1572 1573/* 1574 * Parse the option string and update fields. 1575 * Option arguments may either be -<option>=<value> or 1576 * -<option> <value> 1577 */ 1578int 1579do_opt(cpp, endcpp, ep, grp, has_hostp, exflagsp, cr) 1580 char **cpp, **endcpp; 1581 struct exportlist *ep; 1582 struct grouplist *grp; 1583 int *has_hostp; 1584 int *exflagsp; 1585 struct xucred *cr; 1586{ 1587 char *cpoptarg, *cpoptend; 1588 char *cp, *endcp, *cpopt, savedc, savedc2; 1589 int allflag, usedarg; 1590 1591 savedc2 = '\0'; 1592 cpopt = *cpp; 1593 cpopt++; 1594 cp = *endcpp; 1595 savedc = *cp; 1596 *cp = '\0'; 1597 while (cpopt && *cpopt) { 1598 allflag = 1; 1599 usedarg = -2; 1600 if ((cpoptend = strchr(cpopt, ','))) { 1601 *cpoptend++ = '\0'; 1602 if ((cpoptarg = strchr(cpopt, '='))) 1603 *cpoptarg++ = '\0'; 1604 } else { 1605 if ((cpoptarg = strchr(cpopt, '='))) 1606 *cpoptarg++ = '\0'; 1607 else { 1608 *cp = savedc; 1609 nextfield(&cp, &endcp); 1610 **endcpp = '\0'; 1611 if (endcp > cp && *cp != '-') { 1612 cpoptarg = cp; 1613 savedc2 = *endcp; 1614 *endcp = '\0'; 1615 usedarg = 0; 1616 } 1617 } 1618 } 1619 if (!strcmp(cpopt, "ro") || !strcmp(cpopt, "o")) { 1620 *exflagsp |= MNT_EXRDONLY; 1621 } else if (cpoptarg && (!strcmp(cpopt, "maproot") || 1622 !(allflag = strcmp(cpopt, "mapall")) || 1623 !strcmp(cpopt, "root") || !strcmp(cpopt, "r"))) { 1624 usedarg++; 1625 parsecred(cpoptarg, cr); 1626 if (allflag == 0) { 1627 *exflagsp |= MNT_EXPORTANON; 1628 opt_flags |= OP_MAPALL; 1629 } else 1630 opt_flags |= OP_MAPROOT; 1631 } else if (cpoptarg && (!strcmp(cpopt, "mask") || 1632 !strcmp(cpopt, "m"))) { 1633 if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 1)) { 1634 syslog(LOG_ERR, "bad mask: %s", cpoptarg); 1635 return (1); 1636 } 1637 usedarg++; 1638 opt_flags |= OP_MASK; 1639 } else if (cpoptarg && (!strcmp(cpopt, "network") || 1640 !strcmp(cpopt, "n"))) { 1641 if (strchr(cpoptarg, '/') != NULL) { 1642 if (debug) 1643 fprintf(stderr, "setting OP_MASKLEN\n"); 1644 opt_flags |= OP_MASKLEN; 1645 } 1646 if (grp->gr_type != GT_NULL) { 1647 syslog(LOG_ERR, "network/host conflict"); 1648 return (1); 1649 } else if (get_net(cpoptarg, &grp->gr_ptr.gt_net, 0)) { 1650 syslog(LOG_ERR, "bad net: %s", cpoptarg); 1651 return (1); 1652 } 1653 grp->gr_type = GT_NET; 1654 *has_hostp = 1; 1655 usedarg++; 1656 opt_flags |= OP_NET; 1657 } else if (!strcmp(cpopt, "alldirs")) { 1658 opt_flags |= OP_ALLDIRS; 1659 } else if (!strcmp(cpopt, "public")) { 1660 *exflagsp |= MNT_EXPUBLIC; 1661 } else if (!strcmp(cpopt, "webnfs")) { 1662 *exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON); 1663 opt_flags |= OP_MAPALL; 1664 } else if (cpoptarg && !strcmp(cpopt, "index")) { 1665 ep->ex_indexfile = strdup(cpoptarg); 1666 } else if (!strcmp(cpopt, "quiet")) { 1667 opt_flags |= OP_QUIET; 1668 } else { 1669 syslog(LOG_ERR, "bad opt %s", cpopt); 1670 return (1); 1671 } 1672 if (usedarg >= 0) { 1673 *endcp = savedc2; 1674 **endcpp = savedc; 1675 if (usedarg > 0) { 1676 *cpp = cp; 1677 *endcpp = endcp; 1678 } 1679 return (0); 1680 } 1681 cpopt = cpoptend; 1682 } 1683 **endcpp = savedc; 1684 return (0); 1685} 1686 1687/* 1688 * Translate a character string to the corresponding list of network 1689 * addresses for a hostname. 1690 */ 1691int 1692get_host(cp, grp, tgrp) 1693 char *cp; 1694 struct grouplist *grp; 1695 struct grouplist *tgrp; 1696{ 1697 struct grouplist *checkgrp; 1698 struct addrinfo *ai, *tai, hints; 1699 int ecode; 1700 char host[NI_MAXHOST]; 1701 1702 if (grp->gr_type != GT_NULL) { 1703 syslog(LOG_ERR, "Bad netgroup type for ip host %s", cp); 1704 return (1); 1705 } 1706 memset(&hints, 0, sizeof hints); 1707 hints.ai_flags = AI_CANONNAME; 1708 hints.ai_protocol = IPPROTO_UDP; 1709 ecode = getaddrinfo(cp, NULL, &hints, &ai); 1710 if (ecode != 0) { 1711 syslog(LOG_ERR,"can't get address info for host %s", cp); 1712 return 1; 1713 } 1714 grp->gr_ptr.gt_addrinfo = ai; 1715 while (ai != NULL) { 1716 if (ai->ai_canonname == NULL) { 1717 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, host, 1718 sizeof host, NULL, 0, NI_NUMERICHOST) != 0) 1719 strlcpy(host, "?", sizeof(host)); 1720 ai->ai_canonname = strdup(host); 1721 ai->ai_flags |= AI_CANONNAME; 1722 } 1723 if (debug) 1724 fprintf(stderr, "got host %s\n", ai->ai_canonname); 1725 /* 1726 * Sanity check: make sure we don't already have an entry 1727 * for this host in the grouplist. 1728 */ 1729 for (checkgrp = tgrp; checkgrp != NULL; 1730 checkgrp = checkgrp->gr_next) { 1731 if (checkgrp->gr_type != GT_HOST) 1732 continue; 1733 for (tai = checkgrp->gr_ptr.gt_addrinfo; tai != NULL; 1734 tai = tai->ai_next) { 1735 if (sacmp(tai->ai_addr, ai->ai_addr, NULL) != 0) 1736 continue; 1737 if (debug) 1738 fprintf(stderr, 1739 "ignoring duplicate host %s\n", 1740 ai->ai_canonname); 1741 grp->gr_type = GT_IGNORE; 1742 return (0); 1743 } 1744 } 1745 ai = ai->ai_next; 1746 } 1747 grp->gr_type = GT_HOST; 1748 return (0); 1749} 1750 1751/* 1752 * Free up an exports list component 1753 */ 1754void 1755free_exp(ep) 1756 struct exportlist *ep; 1757{ 1758 1759 if (ep->ex_defdir) { 1760 free_host(ep->ex_defdir->dp_hosts); 1761 free((caddr_t)ep->ex_defdir); 1762 } 1763 if (ep->ex_fsdir) 1764 free(ep->ex_fsdir); 1765 if (ep->ex_indexfile) 1766 free(ep->ex_indexfile); 1767 free_dir(ep->ex_dirl); 1768 free((caddr_t)ep); 1769} 1770 1771/* 1772 * Free hosts. 1773 */ 1774void 1775free_host(hp) 1776 struct hostlist *hp; 1777{ 1778 struct hostlist *hp2; 1779 1780 while (hp) { 1781 hp2 = hp; 1782 hp = hp->ht_next; 1783 free((caddr_t)hp2); 1784 } 1785} 1786 1787struct hostlist * 1788get_ht() 1789{ 1790 struct hostlist *hp; 1791 1792 hp = (struct hostlist *)malloc(sizeof (struct hostlist)); 1793 if (hp == (struct hostlist *)NULL) 1794 out_of_mem(); 1795 hp->ht_next = (struct hostlist *)NULL; 1796 hp->ht_flag = 0; 1797 return (hp); 1798} 1799 1800/* 1801 * Out of memory, fatal 1802 */ 1803void 1804out_of_mem() 1805{ 1806 1807 syslog(LOG_ERR, "out of memory"); 1808 exit(2); 1809} 1810 1811/* 1812 * Do the nmount() syscall with the update flag to push the export info into 1813 * the kernel. 1814 */ 1815int 1816do_mount(struct exportlist *ep, struct grouplist *grp, int exflags, 1817 struct xucred *anoncrp, char *dirp, int dirplen, struct statfs *fsb) 1818{ 1819 struct statfs fsb1; 1820 struct addrinfo *ai; 1821 struct export_args eap; 1822 char errmsg[255]; 1823 char *cp; 1824 int done; 1825 char savedc; 1826 struct iovec *iov; 1827 int iovlen; 1828 int ret; 1829 1830 cp = NULL; 1831 savedc = '\0'; 1832 iov = NULL; 1833 iovlen = 0; 1834 ret = 0; 1835 1836 bzero(&eap, sizeof(eap)); 1837 bzero(errmsg, sizeof(errmsg)); 1838 eap.ex_flags = exflags; 1839 eap.ex_anon = *anoncrp; 1840 eap.ex_indexfile = ep->ex_indexfile; 1841 if (grp->gr_type == GT_HOST) 1842 ai = grp->gr_ptr.gt_addrinfo; 1843 else 1844 ai = NULL; 1845 done = FALSE; 1846 1847 build_iovec(&iov, &iovlen, "fstype", NULL, 0); 1848 build_iovec(&iov, &iovlen, "fspath", NULL, 0); 1849 build_iovec(&iov, &iovlen, "from", NULL, 0); 1850 build_iovec(&iov, &iovlen, "update", NULL, 0); 1851 build_iovec(&iov, &iovlen, "export", &eap, sizeof(eap)); 1852 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg)); 1853 1854 while (!done) { 1855 switch (grp->gr_type) { 1856 case GT_HOST: 1857 if (ai->ai_addr->sa_family == AF_INET6 && have_v6 == 0) 1858 goto skip; 1859 eap.ex_addr = ai->ai_addr; 1860 eap.ex_addrlen = ai->ai_addrlen; 1861 eap.ex_masklen = 0; 1862 break; 1863 case GT_NET: 1864 if (grp->gr_ptr.gt_net.nt_net.ss_family == AF_INET6 && 1865 have_v6 == 0) 1866 goto skip; 1867 eap.ex_addr = 1868 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_net; 1869 eap.ex_addrlen = 1870 ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_net)->sa_len; 1871 eap.ex_mask = 1872 (struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask; 1873 eap.ex_masklen = ((struct sockaddr *)&grp->gr_ptr.gt_net.nt_mask)->sa_len; 1874 break; 1875 case GT_DEFAULT: 1876 eap.ex_addr = NULL; 1877 eap.ex_addrlen = 0; 1878 eap.ex_mask = NULL; 1879 eap.ex_masklen = 0; 1880 break; 1881 case GT_IGNORE: 1882 ret = 0; 1883 goto error_exit; 1884 break; 1885 default: 1886 syslog(LOG_ERR, "bad grouptype"); 1887 if (cp) 1888 *cp = savedc; 1889 ret = 1; 1890 goto error_exit; 1891 }; 1892 1893 /* 1894 * XXX: 1895 * Maybe I should just use the fsb->f_mntonname path instead 1896 * of looping back up the dirp to the mount point?? 1897 * Also, needs to know how to export all types of local 1898 * exportable filesystems and not just "ufs". 1899 */ 1900 iov[1].iov_base = fsb->f_fstypename; /* "fstype" */ 1901 iov[1].iov_len = strlen(fsb->f_fstypename) + 1; 1902 iov[3].iov_base = fsb->f_mntonname; /* "fspath" */ 1903 iov[3].iov_len = strlen(fsb->f_mntonname) + 1; 1904 iov[5].iov_base = fsb->f_mntfromname; /* "from" */ 1905 iov[5].iov_len = strlen(fsb->f_mntfromname) + 1; 1906 1907 while (nmount(iov, iovlen, 0) < 0) { 1908 if (cp) 1909 *cp-- = savedc; 1910 else 1911 cp = dirp + dirplen - 1; 1912 if (opt_flags & OP_QUIET) { 1913 ret = 1; 1914 goto error_exit; 1915 } 1916 if (errno == EPERM) { 1917 if (debug) 1918 warnx("can't change attributes for %s", 1919 dirp); 1920 syslog(LOG_ERR, 1921 "can't change attributes for %s", dirp); 1922 ret = 1; 1923 goto error_exit; 1924 } 1925 if (opt_flags & OP_ALLDIRS) { 1926 if (errno == EINVAL) 1927 syslog(LOG_ERR, 1928 "-alldirs requested but %s is not a filesystem mountpoint", 1929 dirp); 1930 else 1931 syslog(LOG_ERR, 1932 "could not remount %s: %m", 1933 dirp); 1934 ret = 1; 1935 goto error_exit; 1936 } 1937 /* back up over the last component */ 1938 while (*cp == '/' && cp > dirp) 1939 cp--; 1940 while (*(cp - 1) != '/' && cp > dirp) 1941 cp--; 1942 if (cp == dirp) { 1943 if (debug) 1944 warnx("mnt unsucc"); 1945 syslog(LOG_ERR, "can't export %s", dirp); 1946 ret = 1; 1947 goto error_exit; 1948 } 1949 savedc = *cp; 1950 *cp = '\0'; 1951 /* Check that we're still on the same filesystem. */ 1952 if (statfs(dirp, &fsb1) != 0 || bcmp(&fsb1.f_fsid, 1953 &fsb->f_fsid, sizeof(fsb1.f_fsid)) != 0) { 1954 *cp = savedc; 1955 syslog(LOG_ERR, "can't export %s", dirp); 1956 ret = 1; 1957 goto error_exit; 1958 } 1959 } 1960skip: 1961 if (ai != NULL) 1962 ai = ai->ai_next; 1963 if (ai == NULL) 1964 done = TRUE; 1965 } 1966 if (cp) 1967 *cp = savedc; 1968error_exit: 1969 /* free strings allocated by strdup() in getmntopts.c */ 1970 if (iov != NULL) { 1971 free(iov[0].iov_base); /* fstype */ 1972 free(iov[2].iov_base); /* fspath */ 1973 free(iov[4].iov_base); /* from */ 1974 free(iov[6].iov_base); /* update */ 1975 free(iov[8].iov_base); /* export */ 1976 free(iov[10].iov_base); /* errmsg */ 1977 1978 /* free iov, allocated by realloc() */ 1979 free(iov); 1980 } 1981 return (ret); 1982} 1983 1984/* 1985 * Translate a net address. 1986 * 1987 * If `maskflg' is nonzero, then `cp' is a netmask, not a network address. 1988 */ 1989int 1990get_net(cp, net, maskflg) 1991 char *cp; 1992 struct netmsk *net; 1993 int maskflg; 1994{ 1995 struct netent *np = NULL; 1996 char *name, *p, *prefp; 1997 struct sockaddr_in sin; 1998 struct sockaddr *sa = NULL; 1999 struct addrinfo hints, *ai = NULL; 2000 char netname[NI_MAXHOST]; 2001 long preflen; 2002 2003 p = prefp = NULL; 2004 if ((opt_flags & OP_MASKLEN) && !maskflg) { 2005 p = strchr(cp, '/'); 2006 *p = '\0'; 2007 prefp = p + 1; 2008 } 2009 2010 /* 2011 * Check for a numeric address first. We wish to avoid 2012 * possible DNS lookups in getnetbyname(). 2013 */ 2014 if (isxdigit(*cp) || *cp == ':') { 2015 memset(&hints, 0, sizeof hints); 2016 /* Ensure the mask and the network have the same family. */ 2017 if (maskflg && (opt_flags & OP_NET)) 2018 hints.ai_family = net->nt_net.ss_family; 2019 else if (!maskflg && (opt_flags & OP_HAVEMASK)) 2020 hints.ai_family = net->nt_mask.ss_family; 2021 else 2022 hints.ai_family = AF_UNSPEC; 2023 hints.ai_flags = AI_NUMERICHOST; 2024 if (getaddrinfo(cp, NULL, &hints, &ai) == 0) 2025 sa = ai->ai_addr; 2026 if (sa != NULL && ai->ai_family == AF_INET) { 2027 /* 2028 * The address in `cp' is really a network address, so 2029 * use inet_network() to re-interpret this correctly. 2030 * e.g. "127.1" means 127.1.0.0, not 127.0.0.1. 2031 */ 2032 bzero(&sin, sizeof sin); 2033 sin.sin_family = AF_INET; 2034 sin.sin_len = sizeof sin; 2035 sin.sin_addr = inet_makeaddr(inet_network(cp), 0); 2036 if (debug) 2037 fprintf(stderr, "get_net: v4 addr %s\n", 2038 inet_ntoa(sin.sin_addr)); 2039 sa = (struct sockaddr *)&sin; 2040 } 2041 } 2042 if (sa == NULL && (np = getnetbyname(cp)) != NULL) { 2043 bzero(&sin, sizeof sin); 2044 sin.sin_family = AF_INET; 2045 sin.sin_len = sizeof sin; 2046 sin.sin_addr = inet_makeaddr(np->n_net, 0); 2047 sa = (struct sockaddr *)&sin; 2048 } 2049 if (sa == NULL) 2050 goto fail; 2051 2052 if (maskflg) { 2053 /* The specified sockaddr is a mask. */ 2054 if (checkmask(sa) != 0) 2055 goto fail; 2056 bcopy(sa, &net->nt_mask, sa->sa_len); 2057 opt_flags |= OP_HAVEMASK; 2058 } else { 2059 /* The specified sockaddr is a network address. */ 2060 bcopy(sa, &net->nt_net, sa->sa_len); 2061 2062 /* Get a network name for the export list. */ 2063 if (np) { 2064 name = np->n_name; 2065 } else if (getnameinfo(sa, sa->sa_len, netname, sizeof netname, 2066 NULL, 0, NI_NUMERICHOST) == 0) { 2067 name = netname; 2068 } else { 2069 goto fail; 2070 } 2071 if ((net->nt_name = strdup(name)) == NULL) 2072 out_of_mem(); 2073 2074 /* 2075 * Extract a mask from either a "/<masklen>" suffix, or 2076 * from the class of an IPv4 address. 2077 */ 2078 if (opt_flags & OP_MASKLEN) { 2079 preflen = strtol(prefp, NULL, 10); 2080 if (preflen < 0L || preflen == LONG_MAX) 2081 goto fail; 2082 bcopy(sa, &net->nt_mask, sa->sa_len); 2083 if (makemask(&net->nt_mask, (int)preflen) != 0) 2084 goto fail; 2085 opt_flags |= OP_HAVEMASK; 2086 *p = '/'; 2087 } else if (sa->sa_family == AF_INET && 2088 (opt_flags & OP_MASK) == 0) { 2089 in_addr_t addr; 2090 2091 addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; 2092 if (IN_CLASSA(addr)) 2093 preflen = 8; 2094 else if (IN_CLASSB(addr)) 2095 preflen = 16; 2096 else if (IN_CLASSC(addr)) 2097 preflen = 24; 2098 else if (IN_CLASSD(addr)) 2099 preflen = 28; 2100 else 2101 preflen = 32; /* XXX */ 2102 2103 bcopy(sa, &net->nt_mask, sa->sa_len); 2104 makemask(&net->nt_mask, (int)preflen); 2105 opt_flags |= OP_HAVEMASK; 2106 } 2107 } 2108 2109 if (ai) 2110 freeaddrinfo(ai); 2111 return 0; 2112 2113fail: 2114 if (ai) 2115 freeaddrinfo(ai); 2116 return 1; 2117} 2118 2119/* 2120 * Parse out the next white space separated field 2121 */ 2122void 2123nextfield(cp, endcp) 2124 char **cp; 2125 char **endcp; 2126{ 2127 char *p; 2128 2129 p = *cp; 2130 while (*p == ' ' || *p == '\t') 2131 p++; 2132 if (*p == '\n' || *p == '\0') 2133 *cp = *endcp = p; 2134 else { 2135 *cp = p++; 2136 while (*p != ' ' && *p != '\t' && *p != '\n' && *p != '\0') 2137 p++; 2138 *endcp = p; 2139 } 2140} 2141 2142/* 2143 * Get an exports file line. Skip over blank lines and handle line 2144 * continuations. 2145 */ 2146int 2147get_line() 2148{ 2149 char *p, *cp; 2150 size_t len; 2151 int totlen, cont_line; 2152 2153 /* 2154 * Loop around ignoring blank lines and getting all continuation lines. 2155 */ 2156 p = line; 2157 totlen = 0; 2158 do { 2159 if ((p = fgetln(exp_file, &len)) == NULL) 2160 return (0); 2161 cp = p + len - 1; 2162 cont_line = 0; 2163 while (cp >= p && 2164 (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\\')) { 2165 if (*cp == '\\') 2166 cont_line = 1; 2167 cp--; 2168 len--; 2169 } 2170 if (cont_line) { 2171 *++cp = ' '; 2172 len++; 2173 } 2174 if (linesize < len + totlen + 1) { 2175 linesize = len + totlen + 1; 2176 line = realloc(line, linesize); 2177 if (line == NULL) 2178 out_of_mem(); 2179 } 2180 memcpy(line + totlen, p, len); 2181 totlen += len; 2182 line[totlen] = '\0'; 2183 } while (totlen == 0 || cont_line); 2184 return (1); 2185} 2186 2187/* 2188 * Parse a description of a credential. 2189 */ 2190void 2191parsecred(namelist, cr) 2192 char *namelist; 2193 struct xucred *cr; 2194{ 2195 char *name; 2196 int cnt; 2197 char *names; 2198 struct passwd *pw; 2199 struct group *gr; 2200 gid_t groups[NGROUPS + 1]; 2201 int ngroups; 2202 2203 cr->cr_version = XUCRED_VERSION; 2204 /* 2205 * Set up the unprivileged user. 2206 */ 2207 cr->cr_uid = -2; 2208 cr->cr_groups[0] = -2; 2209 cr->cr_ngroups = 1; 2210 /* 2211 * Get the user's password table entry. 2212 */ 2213 names = strsep(&namelist, " \t\n"); 2214 name = strsep(&names, ":"); 2215 if (isdigit(*name) || *name == '-') 2216 pw = getpwuid(atoi(name)); 2217 else 2218 pw = getpwnam(name); 2219 /* 2220 * Credentials specified as those of a user. 2221 */ 2222 if (names == NULL) { 2223 if (pw == NULL) { 2224 syslog(LOG_ERR, "unknown user: %s", name); 2225 return; 2226 } 2227 cr->cr_uid = pw->pw_uid; 2228 ngroups = NGROUPS + 1; 2229 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups)) 2230 syslog(LOG_ERR, "too many groups"); 2231 /* 2232 * Compress out duplicate. 2233 */ 2234 cr->cr_ngroups = ngroups - 1; 2235 cr->cr_groups[0] = groups[0]; 2236 for (cnt = 2; cnt < ngroups; cnt++) 2237 cr->cr_groups[cnt - 1] = groups[cnt]; 2238 return; 2239 } 2240 /* 2241 * Explicit credential specified as a colon separated list: 2242 * uid:gid:gid:... 2243 */ 2244 if (pw != NULL) 2245 cr->cr_uid = pw->pw_uid; 2246 else if (isdigit(*name) || *name == '-') 2247 cr->cr_uid = atoi(name); 2248 else { 2249 syslog(LOG_ERR, "unknown user: %s", name); 2250 return; 2251 } 2252 cr->cr_ngroups = 0; 2253 while (names != NULL && *names != '\0' && cr->cr_ngroups < NGROUPS) { 2254 name = strsep(&names, ":"); 2255 if (isdigit(*name) || *name == '-') { 2256 cr->cr_groups[cr->cr_ngroups++] = atoi(name); 2257 } else { 2258 if ((gr = getgrnam(name)) == NULL) { 2259 syslog(LOG_ERR, "unknown group: %s", name); 2260 continue; 2261 } 2262 cr->cr_groups[cr->cr_ngroups++] = gr->gr_gid; 2263 } 2264 } 2265 if (names != NULL && *names != '\0' && cr->cr_ngroups == NGROUPS) 2266 syslog(LOG_ERR, "too many groups"); 2267} 2268 2269#define STRSIZ (RPCMNT_NAMELEN+RPCMNT_PATHLEN+50) 2270/* 2271 * Routines that maintain the remote mounttab 2272 */ 2273void 2274get_mountlist() 2275{ 2276 struct mountlist *mlp, **mlpp; 2277 char *host, *dirp, *cp; 2278 char str[STRSIZ]; 2279 FILE *mlfile; 2280 2281 if ((mlfile = fopen(_PATH_RMOUNTLIST, "r")) == NULL) { 2282 if (errno == ENOENT) 2283 return; 2284 else { 2285 syslog(LOG_ERR, "can't open %s", _PATH_RMOUNTLIST); 2286 return; 2287 } 2288 } 2289 mlpp = &mlhead; 2290 while (fgets(str, STRSIZ, mlfile) != NULL) { 2291 cp = str; 2292 host = strsep(&cp, " \t\n"); 2293 dirp = strsep(&cp, " \t\n"); 2294 if (host == NULL || dirp == NULL) 2295 continue; 2296 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2297 if (mlp == (struct mountlist *)NULL) 2298 out_of_mem(); 2299 strncpy(mlp->ml_host, host, RPCMNT_NAMELEN); 2300 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2301 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2302 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2303 mlp->ml_next = (struct mountlist *)NULL; 2304 *mlpp = mlp; 2305 mlpp = &mlp->ml_next; 2306 } 2307 fclose(mlfile); 2308} 2309 2310void 2311del_mlist(char *hostp, char *dirp) 2312{ 2313 struct mountlist *mlp, **mlpp; 2314 struct mountlist *mlp2; 2315 FILE *mlfile; 2316 int fnd = 0; 2317 2318 mlpp = &mlhead; 2319 mlp = mlhead; 2320 while (mlp) { 2321 if (!strcmp(mlp->ml_host, hostp) && 2322 (!dirp || !strcmp(mlp->ml_dirp, dirp))) { 2323 fnd = 1; 2324 mlp2 = mlp; 2325 *mlpp = mlp = mlp->ml_next; 2326 free((caddr_t)mlp2); 2327 } else { 2328 mlpp = &mlp->ml_next; 2329 mlp = mlp->ml_next; 2330 } 2331 } 2332 if (fnd) { 2333 if ((mlfile = fopen(_PATH_RMOUNTLIST, "w")) == NULL) { 2334 syslog(LOG_ERR,"can't update %s", _PATH_RMOUNTLIST); 2335 return; 2336 } 2337 mlp = mlhead; 2338 while (mlp) { 2339 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2340 mlp = mlp->ml_next; 2341 } 2342 fclose(mlfile); 2343 } 2344} 2345 2346void 2347add_mlist(hostp, dirp) 2348 char *hostp, *dirp; 2349{ 2350 struct mountlist *mlp, **mlpp; 2351 FILE *mlfile; 2352 2353 mlpp = &mlhead; 2354 mlp = mlhead; 2355 while (mlp) { 2356 if (!strcmp(mlp->ml_host, hostp) && !strcmp(mlp->ml_dirp, dirp)) 2357 return; 2358 mlpp = &mlp->ml_next; 2359 mlp = mlp->ml_next; 2360 } 2361 mlp = (struct mountlist *)malloc(sizeof (*mlp)); 2362 if (mlp == (struct mountlist *)NULL) 2363 out_of_mem(); 2364 strncpy(mlp->ml_host, hostp, RPCMNT_NAMELEN); 2365 mlp->ml_host[RPCMNT_NAMELEN] = '\0'; 2366 strncpy(mlp->ml_dirp, dirp, RPCMNT_PATHLEN); 2367 mlp->ml_dirp[RPCMNT_PATHLEN] = '\0'; 2368 mlp->ml_next = (struct mountlist *)NULL; 2369 *mlpp = mlp; 2370 if ((mlfile = fopen(_PATH_RMOUNTLIST, "a")) == NULL) { 2371 syslog(LOG_ERR, "can't update %s", _PATH_RMOUNTLIST); 2372 return; 2373 } 2374 fprintf(mlfile, "%s %s\n", mlp->ml_host, mlp->ml_dirp); 2375 fclose(mlfile); 2376} 2377 2378/* 2379 * Free up a group list. 2380 */ 2381void 2382free_grp(grp) 2383 struct grouplist *grp; 2384{ 2385 if (grp->gr_type == GT_HOST) { 2386 if (grp->gr_ptr.gt_addrinfo != NULL) 2387 freeaddrinfo(grp->gr_ptr.gt_addrinfo); 2388 } else if (grp->gr_type == GT_NET) { 2389 if (grp->gr_ptr.gt_net.nt_name) 2390 free(grp->gr_ptr.gt_net.nt_name); 2391 } 2392 free((caddr_t)grp); 2393} 2394 2395#ifdef DEBUG 2396void 2397SYSLOG(int pri, const char *fmt, ...) 2398{ 2399 va_list ap; 2400 2401 va_start(ap, fmt); 2402 vfprintf(stderr, fmt, ap); 2403 va_end(ap); 2404} 2405#endif /* DEBUG */ 2406 2407/* 2408 * Check options for consistency. 2409 */ 2410int 2411check_options(dp) 2412 struct dirlist *dp; 2413{ 2414 2415 if (dp == (struct dirlist *)NULL) 2416 return (1); 2417 if ((opt_flags & (OP_MAPROOT | OP_MAPALL)) == (OP_MAPROOT | OP_MAPALL)) { 2418 syslog(LOG_ERR, "-mapall and -maproot mutually exclusive"); 2419 return (1); 2420 } 2421 if ((opt_flags & OP_MASK) && (opt_flags & OP_NET) == 0) { 2422 syslog(LOG_ERR, "-mask requires -network"); 2423 return (1); 2424 } 2425 if ((opt_flags & OP_NET) && (opt_flags & OP_HAVEMASK) == 0) { 2426 syslog(LOG_ERR, "-network requires mask specification"); 2427 return (1); 2428 } 2429 if ((opt_flags & OP_MASK) && (opt_flags & OP_MASKLEN)) { 2430 syslog(LOG_ERR, "-mask and /masklen are mutually exclusive"); 2431 return (1); 2432 } 2433 if ((opt_flags & OP_ALLDIRS) && dp->dp_left) { 2434 syslog(LOG_ERR, "-alldirs has multiple directories"); 2435 return (1); 2436 } 2437 return (0); 2438} 2439 2440/* 2441 * Check an absolute directory path for any symbolic links. Return true 2442 */ 2443int 2444check_dirpath(dirp) 2445 char *dirp; 2446{ 2447 char *cp; 2448 int ret = 1; 2449 struct stat sb; 2450 2451 cp = dirp + 1; 2452 while (*cp && ret) { 2453 if (*cp == '/') { 2454 *cp = '\0'; 2455 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2456 ret = 0; 2457 *cp = '/'; 2458 } 2459 cp++; 2460 } 2461 if (lstat(dirp, &sb) < 0 || !S_ISDIR(sb.st_mode)) 2462 ret = 0; 2463 return (ret); 2464} 2465 2466/* 2467 * Make a netmask according to the specified prefix length. The ss_family 2468 * and other non-address fields must be initialised before calling this. 2469 */ 2470int 2471makemask(struct sockaddr_storage *ssp, int bitlen) 2472{ 2473 u_char *p; 2474 int bits, i, len; 2475 2476 if ((p = sa_rawaddr((struct sockaddr *)ssp, &len)) == NULL) 2477 return (-1); 2478 if (bitlen > len * CHAR_BIT) 2479 return (-1); 2480 2481 for (i = 0; i < len; i++) { 2482 bits = (bitlen > CHAR_BIT) ? CHAR_BIT : bitlen; 2483 *p++ = (1 << bits) - 1; 2484 bitlen -= bits; 2485 } 2486 return 0; 2487} 2488 2489/* 2490 * Check that the sockaddr is a valid netmask. Returns 0 if the mask 2491 * is acceptable (i.e. of the form 1...10....0). 2492 */ 2493int 2494checkmask(struct sockaddr *sa) 2495{ 2496 u_char *mask; 2497 int i, len; 2498 2499 if ((mask = sa_rawaddr(sa, &len)) == NULL) 2500 return (-1); 2501 2502 for (i = 0; i < len; i++) 2503 if (mask[i] != 0xff) 2504 break; 2505 if (i < len) { 2506 if (~mask[i] & (u_char)(~mask[i] + 1)) 2507 return (-1); 2508 i++; 2509 } 2510 for (; i < len; i++) 2511 if (mask[i] != 0) 2512 return (-1); 2513 return (0); 2514} 2515 2516/* 2517 * Compare two sockaddrs according to a specified mask. Return zero if 2518 * `sa1' matches `sa2' when filtered by the netmask in `samask'. 2519 * If samask is NULL, perform a full comparision. 2520 */ 2521int 2522sacmp(struct sockaddr *sa1, struct sockaddr *sa2, struct sockaddr *samask) 2523{ 2524 unsigned char *p1, *p2, *mask; 2525 int len, i; 2526 2527 if (sa1->sa_family != sa2->sa_family || 2528 (p1 = sa_rawaddr(sa1, &len)) == NULL || 2529 (p2 = sa_rawaddr(sa2, NULL)) == NULL) 2530 return (1); 2531 2532 switch (sa1->sa_family) { 2533 case AF_INET6: 2534 if (((struct sockaddr_in6 *)sa1)->sin6_scope_id != 2535 ((struct sockaddr_in6 *)sa2)->sin6_scope_id) 2536 return (1); 2537 break; 2538 } 2539 2540 /* Simple binary comparison if no mask specified. */ 2541 if (samask == NULL) 2542 return (memcmp(p1, p2, len)); 2543 2544 /* Set up the mask, and do a mask-based comparison. */ 2545 if (sa1->sa_family != samask->sa_family || 2546 (mask = sa_rawaddr(samask, NULL)) == NULL) 2547 return (1); 2548 2549 for (i = 0; i < len; i++) 2550 if ((p1[i] & mask[i]) != (p2[i] & mask[i])) 2551 return (1); 2552 return (0); 2553} 2554 2555/* 2556 * Return a pointer to the part of the sockaddr that contains the 2557 * raw address, and set *nbytes to its length in bytes. Returns 2558 * NULL if the address family is unknown. 2559 */ 2560void * 2561sa_rawaddr(struct sockaddr *sa, int *nbytes) { 2562 void *p; 2563 int len; 2564 2565 switch (sa->sa_family) { 2566 case AF_INET: 2567 len = sizeof(((struct sockaddr_in *)sa)->sin_addr); 2568 p = &((struct sockaddr_in *)sa)->sin_addr; 2569 break; 2570 case AF_INET6: 2571 len = sizeof(((struct sockaddr_in6 *)sa)->sin6_addr); 2572 p = &((struct sockaddr_in6 *)sa)->sin6_addr; 2573 break; 2574 default: 2575 p = NULL; 2576 len = 0; 2577 } 2578 2579 if (nbytes != NULL) 2580 *nbytes = len; 2581 return (p); 2582} 2583 2584void 2585huphandler(int sig) 2586{ 2587 got_sighup = 1; 2588} 2589 2590void terminate(sig) 2591int sig; 2592{ 2593 pidfile_remove(pfh); 2594 rpcb_unset(RPCPROG_MNT, RPCMNT_VER1, NULL); 2595 rpcb_unset(RPCPROG_MNT, RPCMNT_VER3, NULL); 2596 exit (0); 2597} 2598